/* Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.activiti.rest.service.api.runtime.process;

import org.activiti.engine.ActivitiIllegalArgumentException;
import org.activiti.engine.runtime.ProcessInstance;
import org.activiti.rest.service.api.engine.RestIdentityLink;
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.*;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.List;


/**
 * @author Frederik Heremans
 */
@RestController
public class ProcessInstanceIdentityLinkCollectionResource extends BaseProcessInstanceResource {

    @RequestMapping(value = "/runtime/process-instances/{processInstanceId}/identitylinks", method = RequestMethod.GET, produces = "application/json")
    public List<RestIdentityLink> getIdentityLinks(@PathVariable String processInstanceId, HttpServletRequest request) {
        ProcessInstance processInstance = getProcessInstanceFromRequest(processInstanceId);
        return restResponseFactory.createRestIdentityLinks(runtimeService.getIdentityLinksForProcessInstance(processInstance.getId()));
    }

    @RequestMapping(value = "/runtime/process-instances/{processInstanceId}/identitylinks", method = RequestMethod.POST, produces = "application/json")
    public RestIdentityLink createIdentityLink(@PathVariable String processInstanceId, @RequestBody RestIdentityLink identityLink,
                                               HttpServletRequest request, HttpServletResponse response) {

        ProcessInstance processInstance = getProcessInstanceFromRequest(processInstanceId);

        if (identityLink.getGroup() != null) {
            throw new ActivitiIllegalArgumentException("Only user identity links are supported on a process instance.");
        }

        if (identityLink.getUser() == null) {
            throw new ActivitiIllegalArgumentException("The user is required.");
        }

        if (identityLink.getType() == null) {
            throw new ActivitiIllegalArgumentException("The identity link type is required.");
        }

        runtimeService.addUserIdentityLink(processInstance.getId(), identityLink.getUser(), identityLink.getType());

        response.setStatus(HttpStatus.CREATED.value());

        return restResponseFactory.createRestIdentityLink(identityLink.getType(), identityLink.getUser(),
                identityLink.getGroup(), null, null, processInstance.getId());
    }
}
